Oh Sorcerer, how thou dost tantalize us! So familiar and yet so unplaceable! Much like the Slime Creature, many of my predecessors in the field of Horror Top Trumpology have simply thrown up their hands in despair and claimed this is just a generic Bad Wizard pic, one of the those rare original pieces by the artist of these decks.
However there is something nagglingly familiar about the Sorcerer. For a long time I had the feeling that perhaps he was cribbed from a '70s comic book, but alas, despite searching high and low I still have never found a doppelganger for this rogue. But looking at him again recently, another possibility suggested itself - consider those arched eyebrows, that pronounced nose, and that pencil mustache - could this be a very rough image of the great Vincent Price? From the lurid lighting, black robes, and the pustules on his face I'd guess perhaps a still from the classic Masque of the Red Death, directed by Roger Corman in 1964... However unfortunately I can find no corresponding still to match.
When I looked closer at the card, I did notice that our mysterious friend seems to have bloodstained fangs. And putting that together with the pencil mustache, I did wonder whether this is based on a frame from Marvel's classic Tomb of Dracula, who modelled the Count on Jack Palance. But I have yet to locate a matching panel. But, if any of you recognize the Sorcerer, do get in touch!